Reinforced impervious paper and method of making same.



A. F. SCHENKELBERGER.

REINFORCED IMPERVIOUS PAPER AND METHOD OF MAKING SAME.

APPLICATION FILED JULY l8. WM.

1 ,270,250. Patented June 18, 1918.

. Z Q- W wrappin PATENT OFFICE.

ntnnn'r r. scnmmnmnnee o uassn cnusn'r'rs, essrenon 'ro sernrecx PAPERMILLS, or nnocigro myglnasnonusn'rrs, A connonA'rIoN or MASSACHU- SETTS.

nnmroncnn mrnnvloqs PAPER AND ETHOD or MAKING SAME.

Specification 01' Letters llatent. Patented June is, rare.

Application iued July 1;, i914. s mlno. 851,701.

- To all whom it may concern:

resident of Quincy, county of Norfolk, Commonwealth of Massachusetts,have invented an Improvement in Reinforced Impervious Paper and Methodsof Making Same, of which the following description, in connection withthe accompanying drawmgs, 1s a specification, like characters on thedrawings representing like parts in each of the several views. a

This invention relates to wrapping, 11ning, or sheathing materialcomposed of aper coated or impregnated with composition to render itwaterproof or impervious and with a reinforcing element of textile fiberapplied to and embedded in the material with which the paper is coatedor impregnated The invention also has to do with an improved method forproducing such and like material cheaply, and preferab y to a largeextent from material that would otherwise be waste. In accordancewith'my invention I treat the paper 'with a composition that leaves atemporarily sticky surface, this composition when it isdesired to makethe wrapping impervioiis, being preferably asphaltum or like pitch.;-Tothis sticky surface I apply unspun textile fiber, preferably cotton orflax fiber as it leaves the carding machine, or loose waste fiber. Insome cases another sheetof paper may be laid upon'the fiber coveredsurface, thus forming a two-ply pa per with the reinforcing fiberbetween. The invention will be better understood from the followingdetailed description taken in connection with the accompanying drawingsand will be thereafter pointed out in the appended claims.

Referring to the draw1ngs: Figure 1 is a diagrammatlc perspectiveshowing one way in which my Invention may be carried out;

Fig. 2 is a similar view showing another form of the invention; and

Fig. 3 is a similar view showing still another embodiment thereof.

A paper web 10 as it is fed along in any desired manner (not shown) istreated with an application of impre means shown as a roll 11 whichthrough atmg and coating ma-' terial such as aspha tum pitch by suitablean intermediate roll is supplied from a pitch pot'12. The sticky coatedsurface of the material indicated at 13 then hasthe loose unspun fiber,such as carded cotton fiber applied thereto. As seenin Fig. lithis fiber1s applied in a thin gauzy web 14 for instance as it comes from thedofi'er drum of a carding machine and it may pass under and be pressedon to the sticky surface of the paper by a roll '15. In the form of theinvention shown in Fig-=2 the fiber ap lied to the sticky surface of thepaper is oose waste fiber which may be blown on to the surface by an airblast from a blower mouth 16. It will be understood that while the thinsliver web 14 in the one case and the light filmy fibers blown upon thematerial in the other case, are apparently weak and unsubstantial, stillwhen these are embedded in the sticky surface of the paper, the fulltensile strength of each individual fiber is obtained, and these fibersare distributed more evenly in every direction than would be the casewith spun and woven fiber. In Fig. 3 I show a web 17 composed ofassembled ribbons or slivers of unspun fiber which is pressed on to thesticky surface by a roll 18. This 'of course has considerably more bodythan the fiber applications of the two precedingl forms and is suitablefor use in making eavier wrappings. The application of fiber asdescribedin each form of the invention is desirable not only in that itreinforces and strengthens the paper, but also partially covering andprotecting the sticky when only one paper layer is employed, in

surface so that it will not smear or be face for the purpose ofreinforcing the'paper and protecting the sticky surface. I

therefore refer to the appended claims rather than to the foregoingdescription to indicate the scope of the invention.

Having described my invention, what I claim as new and desire to secureby Letters Patent is: I

1. The herein described method which consists in treating paper with .acomposition to produce a stlcky surface, applying loose unspun textilefiber upon such surface to reinforce the paper and protect said surface,and applying a second layer of sheet material to said surface to make atwo ply wrap ping.

2. llhe herein described method which consists in treating paper with apitch co mposition to render the same IIIIPBIVIOIIS Wlllll to render itwaterproof with a sticky) herein described method which consists intreating paper with composition surface, applying carded unspun textilefi er to said surface, and applying a second layer of paper to saidsurface to make a two-ply wrappmg. i

i. A wrapping or like material composed of two layers of paper with anintermediate filling of sticky composition to render the sameWaterproof, and loose disconnected textile fiber filaments v embedded insaid sticky composition for the purpose stated.

In testimony whereof I have signed my 4 name to this specification inthe presence of two subscribing witnesses.

ALBERT F. SCHENKELBERGER.

